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    • 62. 发明授权
    • Thermal actuator with reduced temperature extreme and method of operating same
    • 具有降低温度极限的热致动器和操作方法相同
    • US06886920B2
    • 2005-05-03
    • US10693162
    • 2003-10-24
    • David P. TrauernichtEdward P. FurlaniJohn A. Lebens
    • David P. TrauernichtEdward P. FurlaniJohn A. Lebens
    • B41J2/045B41J2/055B41J2/14B41J2/16B41J2/05
    • B41J2/14427B41J2/1623B41J2/1628B41J2/1639B41J2/1646B41J2/1648
    • An apparatus for a thermal actuator for a micromechanical device, especially a liquid drop emitter such as an ink jet printhead, is disclosed. The disclosed thermal actuator comprises a base element and a cantilevered element extending from the base element and normally residing at a first position before activation. The cantilevered element includes a first layer constructed of an electrically resistive material, such as titanium aluminide, patterned to have a first resistor segment and a second resistor segment each extending from the base element; a coupling device that conducts electrical current serially between the first and second resistor segments; and a second layer constructed of a dielectric material having a low coefficient of thermal expansion and attached to the first layer. A first electrode connected to the first resistor segment and a second electrode connected to the second resistor segment are provided to apply an electrical voltage pulse between the first and second electrodes thereby causing an activation power density in the first and second resistor segments and a power density maximum within the coupling device resulting in a deflection of the cantilevered element to a second position and wherein the power density maximum is less than four times the activation power density. The coupling device may be formed as a segment in the first layer or in a third layer of an electrically active material. Methods of operating a liquid drop emitter having a thermal actuator are disclosed which avoid the generation of vapor bubbles.
    • 公开了一种用于微机械装置的热致动器的装置,特别是诸如喷墨打印头的液滴发射器。 所公开的热致动器包括基座元件和从基座元件延伸的通常位于激活之前的第一位置处的悬臂元件。 悬臂元件包括由诸如钛铝化物的电阻材料构成的第一层,其被图案化以具有每个从基底元件延伸的第一电阻器段和第二电阻器段; 耦合装置,其在第一和第二电阻器段之间串联地传导电流; 以及由具有低热膨胀系数并附着到第一层的电介质材料构成的第二层。 提供连接到第一电阻器段的第一电极和连接到第二电阻器段的第二电极以在第一和第二电极之间施加电压脉冲,从而引起第一和第二电阻器段中的激活功率密度和功率密度 耦合装置内的最大值导致悬臂元件偏转到第二位置,并且其中功率密度最大值小于激活功率密度的四倍。 耦合装置可以形成为第一层中的一段或电活性材料的第三层。 公开了具有热致动器的液滴发射器的操作方法,其避免产生蒸气泡。
    • 63. 发明授权
    • Thermal actuator with reduced temperature extreme and method of operating same
    • US06685303B1
    • 2004-02-03
    • US10218788
    • 2002-08-14
    • David P. TrauernichtEdward P. FurlaniJohn A. Lebens
    • David P. TrauernichtEdward P. FurlaniJohn A. Lebens
    • H01H7118
    • B41J2/14427B41J2/1623B41J2/1628B41J2/1639B41J2/1646B41J2/1648
    • An apparatus for a thermal actuator for a micromechanical device, especially a liquid drop emitter such as an ink jet printhead, is disclosed. The disclosed thermal actuator comprises a base element and a cantilevered element extending from the base element and normally residing at a first position before activation. The cantilevered element includes a first layer constructed of an electrically resistive material, such as titanium aluminide, patterned to have a first resistor segment and a second resistor segment each extending from the base element; a coupling device that conducts electrical current serially between the first and second resistor segments; and a second layer constructed of a dielectric material having a low coefficient of thermal expansion and attached to the first layer. A first electrode connected to the first resistor segment and a second electrode connected to the second resistor segment are provided to apply an electrical voltage pulse between the first and second electrodes thereby causing an activation power density in the first and second resistor segments and a power density maximum within the coupling device resulting in a deflection of the cantilevered element to a second position and wherein the power density maximum is less than four times the activation power density. The coupling device may be formed as a segment in the first layer or in a third layer of an electrically active material. Methods of operating a liquid drop emitter having a thermal actuator are disclosed which avoid the generation of vapor bubbles.
    • 64. 发明授权
    • Multi-layer thermal actuator with optimized heater length and method of operating same
    • US06598960B1
    • 2003-07-29
    • US10154634
    • 2002-05-23
    • Antonio CabalEdward P. FurlaniJohn A. LebensDavid P. TrauernichtDavid S. Ross
    • Antonio CabalEdward P. FurlaniJohn A. LebensDavid P. TrauernichtDavid S. Ross
    • B41J205
    • B41J2/14427B41J2/1623B41J2/1628B41J2/1639B41J2/1646B41J2/1648
    • An apparatus for and method of operating a thermal actuator for a micromechanical device, especially a liquid drop emitter such as an ink jet printhead, is disclosed. The disclosed thermal actuator comprises a base element and a cantilevered element extending a length L from a base element and normally residing at a first position before activation. The cantilevered element includes a barrier layer constructed of a dielectric material having low thermal conductivity, a first deflector layer constructed of a first electrically resistive material having a large coefficient of thermal expansion and patterned to have a first uniform resistor portion extending a length LH1 from the base element, wherein 0.3L≦LH1≦0.7L, and a second deflector layer constructed of a second electrically resistive material having a large coefficient of thermal expansion and patterned to have a second uniform resistor portion extending a length LH2 from the base element, wherein 0.3L≦LH2≦0.7L, and wherein the barrier layer is bonded between the first and second deflector layers. The thermal actuator further comprises a first pair of electrodes connected to the first uniform resistor portion and a second pair of electrodes is connected to the second uniform resistor portion for applying electrical pulses to cause resistive heating of the first or second deflector layers, resulting in thermal expansion of the first or second deflector layer relative to the other. Application of an electrical pulse to either pair of electrodes causes deflection of the cantilevered element away from its first position and, alternately, causes a positive or negative pressure in the liquid at the nozzle of a liquid drop emitter. Application of electrical pulses to the pairs of electrodes is used to adjust the characteristics of liquid drop emission. The barrier layer exhibits a heat transfer time constant &tgr;B. The thermal actuator is activated by a heat pulses of duration &tgr;P wherein &tgr;P
    • 65. 发明授权
    • Thermal actuator drop-on-demand apparatus and method for high frequency
    • 热致动器按需设备和高频方法
    • US06460972B1
    • 2002-10-08
    • US09993150
    • 2001-11-06
    • David P. TrauernichtJohn A. Lebens
    • David P. TrauernichtJohn A. Lebens
    • B41J204
    • B41J2/04585B41J2/04588
    • A liquid drop emitter, such as an ink jet device, for emitting a series of liquid drops at high frequency is disclosed. The drop emitter comprises a liquid-filled chamber having a nozzle, a thermo-mechanical actuator for applying pressure to liquid at the nozzle, means for heating the thermo-mechanical actuator in response to electrical pulses, and a controller for determining the parameters of the electrical pulses. The method of operating comprises determining a nominal electrical pulse having a nominal energy E0, a nominal pulse duration TP0, which causes the emission of at least one drop at a sustained period of repetition TC. The method of operating further determines a steady state electrical pulse having energy E0, a steady state pulse duration TPss, which, when applied to the electroresistive means does not cause the emission or weeping of the liquid from the nozzle. The method applies to the means for heating, during every period of time TC, a nominal electrical pulse to emit at least one drop, or a steady state electrical pulse, so that an average power PAVE, where PAVE=E0/TC, is applied to the liquid drop emitter in order to maintain a steady state thermal condition.
    • 公开了一种用于以高频发射一系列液滴的液滴发射器,例如喷墨装置。 液滴发射器包括具有喷嘴的液体填充室,用于在喷嘴处对液体施加压力的热机械致动器,用于响应于电脉冲加热热机械致动器的装置,以及用于确定 电脉冲。 操作的方法包括确定具有标称能量E0的标称电脉冲,标称脉冲持续时间TP0,其导致在持续的重复周期TC发射至少一滴。 操作方法进一步确定具有能量E0,稳定状态脉冲持续时间TPss的稳态电脉冲,其在施加到电阻装置时不引起来自喷嘴的液体的发射或哭泣。 该方法适用于加热装置,在每个时间段TC期间,发出至少一滴的标称电脉冲或稳态电脉冲,使得施加PAVE = E0 / TC的平均功率PAVE 到液滴发射器,以保持稳态热条件。
    • 68. 发明授权
    • Method of characterizing array of resistive heaters
    • 表征电阻加热器阵列的方法
    • US08439477B2
    • 2013-05-14
    • US13190505
    • 2011-07-26
    • Roger G. MarkhamDavid P. TrauernichtJohn A. LebensChristopher R. Morton
    • Roger G. MarkhamDavid P. TrauernichtJohn A. LebensChristopher R. Morton
    • B41J29/393
    • B41J2/14129B41J2/1412
    • A method of characterizing an array of resistive heaters, a first resistive heater of the array having a nominal sheet resistance, a first nominal length and a first nominal width, the method includes (a) providing a first configuration test resistor disposed proximate the first resistive heater, the first configuration test resistor including a second nominal length and a second nominal width, wherein the second nominal length is different from the first nominal length; (b) measuring a resistance of the first resistive heater; (c) measuring a resistance of the first configuration test resistor; and (d) determining the actual sheet resistance and the actual length of the first resistive heater based on the measured resistances of the first resistive heater and the first configuration test resistor.
    • 一种表征电阻加热器阵列的方法,所述阵列的第一电阻加热器具有标称薄层电阻,第一标称长度和第一标称宽度,所述方法包括(a)提供设置在第一电阻 加热器,第一配置测试电阻器包括第二标称长度和第二标称宽度,其中第二标称长度不同于第一标称长度; (b)测量第一电阻加热器的电阻; (c)测量第一配置测试电阻的电阻; 以及(d)基于所测量的第一电阻加热器和第一配置测试电阻器的电阻确定第一电阻加热器的实际薄层电阻和实际长度。
    • 70. 发明授权
    • Tri-layer thermal actuator and method of operating
    • 三层热传动器及其操作方法
    • US06588884B1
    • 2003-07-08
    • US10071120
    • 2002-02-08
    • Edward P. FurlaniJohn A. LebensDavid P. Trauernicht
    • Edward P. FurlaniJohn A. LebensDavid P. Trauernicht
    • B41J204
    • B41J2/14427
    • An apparatus for and method of operating a thermal actuator for a micromechanical device, especially a liquid drop emitter such as an ink jet printhead, is disclosed. The disclosed thermal actuator comprises a base element and a cantilevered element extending from the base element and normally residing at a first position before activation. The cantilevered element includes a barrier layer constructed of a low thermal conductivity material, bonded between a deflector layer and a restorer layer, both of which are constructed of materials having substantially equal coefficients of thermal expansion. The thermal actuator further comprises an apparatus adapted to apply a heat pulse directly to the deflector layer, causing a thermal expansion of the deflector layer relative to the restorer layer and deflection of the cantilevered element to a second position, followed by restoration of the cantilevered element to the first position as heat diffuses through the barrier layer to the restorer layer and the cantilevered element reaches a uniform temperature. When used as a thermal actuator for liquid drop emitters, the cantilevered element resides in a liquid-filled chamber that includes a nozzle for ejecting liquid. Application of a heat pulse to the cantilevered element causes deflection of a free end forcing liquid from the nozzle. The barrier layer exhibits a heat transfer time constant &tgr;B. The thermal actuator is activated by a heat pulse of duration &tgr;P at a repetion time of at least &tgr;C, wherein &tgr;P 3 &tgr;B.
    • 公开了一种操作用于微机械装置的热致动器的装置和方法,特别是诸如喷墨打印头的液滴发射器。 所公开的热致动器包括基座元件和从基座元件延伸的通常位于激活之前的第一位置处的悬臂元件。 悬臂元件包括由低导热材料构成的阻挡层,其结合在偏转器层和恢复层之间,两者均由具有基本上相等的热膨胀系数的材料构成。 热致动器还包括适于将热脉冲直接施加到偏转器层的装置,导致偏转器层相对于恢复层的热膨胀和悬臂元件的偏转到第二位置,随后还原悬臂元件 到达第一位置,因为热通过阻挡层扩散到恢复层,并且悬臂元件达到均匀的温度。 当用作液滴发射器的热致动器时,悬臂元件位于包括用于喷射液体的喷嘴的充满液体的腔室中。 将热脉冲施加到悬臂元件引起自由端的偏转迫使液体从喷嘴出来。 阻挡层表现出传热时间常数τBB。 热致动器在至少tauC的重复时间由持续时间ττ的加热脉冲激活,其中tauP <½tauB和tauC> 3 tauB。